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STL to GLB converter

Drop your .stl file — we convert it to .glb right in your browser. Files never leave your computer.

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Drop your STL file here
Accepts .stl · converts to .glb

STL vs GLB— what's the difference?

STL.stl

Triangle-mesh format that every 3D printer slicer understands. Geometry only — no units, colours, or assemblies.

Strengths
  • Universal 3D printing format — Cura, PrusaSlicer, Bambu Studio all speak STL
  • Tiny, simple, extremely fast to load
  • Great for meshing workflows, simulation pre-processors, quick previews
Limitations
  • Triangulated approximation — curved surfaces lose precision
  • No colour, material, or assembly data
  • One shell per file by convention (multi-body gets flattened)
Typical use: 3D printing, rapid prototyping, mesh-based workflows
GLB.glb

Binary glTF — the JPEG of 3D. Self-contained, small, and loads natively on the web, in AR, and in every modern 3D engine.

Strengths
  • Everything (geometry, textures, materials, animations) packed into one file
  • Tiny and fast — designed for streaming and web delivery
  • Native support in Blender, Unity, Unreal, three.js, <model-viewer>, Android ARCore…
  • PBR materials (metallic-roughness) render consistently everywhere
Limitations
  • Binary — not hand-editable
  • Less common in traditional CAD pipelines
Typical use: Web 3D, AR/VR, real-time engines, e-commerce product views

How to convert STL to GLB

  1. 1
    Drop a .stl file onto the page. Binary or ASCII STL both work. Everything runs locally.
  2. 2
    Preview the mesh in 3D and confirm the geometry looks right.
  3. 3
    Click Download .GLB. Embed in three.js, <model-viewer>, Unity, Unreal, or Android ARCore.

FAQ

Why convert STL to GLB?

STL is a 3D-printing interchange format with no material or colour. GLB is the web-native 3D format — tiny, self-contained, and renders natively in every browser and AR runtime. If you want to show the model online, GLB is what you want.

Will the GLB be smaller than the STL?

Roughly comparable. Binary STL and GLB both pack vertices tightly; GLB adds small scene metadata but compresses vertex indices more efficiently. Expect ±20%.

Does it add a material?

GLTFExporter writes a default PBR metallic-roughness material so the model is visible. STL carries no material data, so there is nothing to preserve — set a proper material in your target engine.

Can I drop the GLB into <model-viewer> for a web AR button?

Yes — that is the canonical use case. Combine with an Android ARCore-compatible Scene Viewer link and you have one-tap AR from any mobile browser.

Is anything uploaded?

No. Three.js loads the STL in your browser and re-exports GLB via GLTFExporter. The file never leaves your machine.

Related converters

STL → OBJOBJ → GLBSTEP → GLBFBX → GLB